Hi,

I have some stupid problem with LineChartProvider. I was able to set up BarChartProvider as in the Demo.java and graphs were rendered. But when I am doing the same with LineChartProvider i get the exception. Here is the trace:

Code:
[ERROR] Unable to load module entry point class com.sungard.testqa.magellan.client.FastVersions (see associated exception for details)
java.lang.NullPointerException: null
    at com.extjs.gxt.ui.client.data.NestedModelUtil.isNestedProperty(NestedModelUtil.java:68)
    at com.extjs.gxt.ui.client.data.BaseModelData.get(BaseModelData.java:42)
    at ext.ux.ofcgxt.client.data.ModelChartProvider$2.getStringValue(ModelChartProvider.java:94)
    at ext.ux.ofcgxt.client.data.LineChartProvider.updateChartModelData(LineChartProvider.java:97)
    at ext.ux.ofcgxt.client.data.BaseModelChartBuilder.buildJsonData(BaseModelChartBuilder.java:77)
    at ext.ux.ofcgxt.client.GxtChartWidget.refresh(GxtChartWidget.java:64)
    at ext.ux.ofcgxt.client.GxtChartWidget.setModelChartBuilder(GxtChartWidget.java:78)
    at com.sungard.testqa.magellan.client.FastVersions.onModuleLoad(FastVersions.java:90)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:320)
    at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace(BrowserWidget.java:329)
    at com.google.gwt.dev.shell.ie.BrowserWidgetIE6.access$300(BrowserWidgetIE6.java:37)
    at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad(BrowserWidgetIE6.java:76)
    at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.invoke(BrowserWidgetIE6.java:139)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
    at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
    at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
    at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
    at com.google.gwt.dev.GWTShell.pumpEventLoop(GWTShell.java:720)
    at com.google.gwt.dev.GWTShell.run(GWTShell.java:593)
    at com.google.gwt.dev.GWTShell.main(GWTShell.java:357)
Probably there is something wrong with my store?? But it is very simple. If anyone can have a look at this or simply give me the code of working LineChart it would be great!

Here is the code:
Code:
        final ListStore<Duration2> store2 = new ListStore<Duration2>();
        store2.add(new Duration2("Q1", 2));
        store2.add(new Duration2("Q2", 1));
        store2.add(new Duration2("Q3", 3));
        store2.add(new Duration2("Q4", 5));

        final GxtChartWidget chart1 = new GxtChartWidget();
          

         BaseModelChartBuilder builder = new BaseModelChartBuilder();
        
         final LineChartProvider<Duration2> lcp = new LineChartProvider<Duration2>(LineChart.LineStyle.NORMAL, "alphasales");
         lcp.setStore(store2);
       
         builder.getChartData().setTitle(new Text("Sales by Qtr (Alpha & Beta Teams)"));
         builder.getChartData().setBackgroundColour("#eeeeee");
         builder.addProvider(lcp);
         betacp.getBarChart().setColour("#00aa00");
        
         chart1.setModelChartBuilder(builder);

        
        cont.add(chart1, new RowData(1f, 0.65f));
        view.add(cont, new BorderLayoutData(LayoutRegion.CENTER));
        RootPanel.get().add(view);

........
public class Duration2 extends BaseModel {
        /**
         * 
         */
        private static final long serialVersionUID = -2697488328170513282L;

        public Duration2(String qtr, double a) {
            setQtr(qtr);
            setAlphaSales(a);
            
        }

        public void setQtr(String qtr) {
            set("qtr", qtr);
        }

        public String getQtr() {
            return get("qtr");
        }

        public void setAlphaSales(double sales) {
            set("alphasales", sales);
        }

        public String getAlphaSales() {
            return get("alphasales");
        }        

    }
Thank you,
Stepan